Number of 2-colorings of a 4 X n rectangle such that no nontrivial subsquare has monochromatic corners.

A255255

Number of 2-colorings of a 4 X n rectangle such that no nontrivial subsquare has monochromatic corners.

Terms

    a(0) =1a(1) =16a(2) =178a(3) =1498a(4) =10980a(5) =85138a(6) =655090a(7) =5115398a(8) =39914386a(9) =312388874a(10) =2436283602a(11) =18994966598a(12) =148059349634

External references